find the value of the the missing angle in grades in each of the following figures.

Answer:
Step-by-step explanation:
Angle on a straight line = 180°
Given Angles :
60°g and 80°g
Let the unknown angle be x
[tex]x + 60 + 80 = 180 \\ x + 140 = 180 \\ x = 180 - 140 \\ x= 40[/tex]